Gauge cock



April 28, 1925. 1,535,576 I G. B. CLARK GAUGE COCK I Filed Sept. 15 1924 INVENTOR Patented Apr. 28, 1925.

GEORGE B. CLARK, OF PITTSBURGH, PENNSYLVANIA.

I GAUGE COCK.

Application filed September 15, 1924. Serial No. 237,835.

To all whom it may concern:

Be 1t known that I, GEORGE B. CLARK, a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny andv deli-stood that it may be also employed in connection with any container for fluids under pressure, where an auxiliary closing device or valve is desired in connection with main valve. Grange cocks such as employed on locomotive boilers must be free from leakage. Leakage permits the escape of steam from the boiler and may tend to obscure the engineei"s vision. An engine equipped with a leaky gauge cock may not be employed in interstate commerce, and it frequently happens that a locomotive must be withdrawn from service in order to permit correction of such defect. In the devices heretofore employed, it has been necessary to blow off the boiler to reduce the pressure therein before removing the gauge cock to permit regrinding of the valve or substitution of a new valve.

One object of my invention is to provide a valve which may be quickly and readily reground without removing the engine from service and without withdrawing the fire therefrom.

Another object of my invention is to simplify and improve generally the structure and operation offiuid pressure valves.

One form which my invention may take is shown in the accompanying drawing wherein Fig. 1 is a view, partially in side elevation and partially in section, of a gauge cock structure embodying my invention, with the "elves thereof in one position; Fig. 2 is a similar view showing the valves inanother position; Fig. 3 is a rear elevational view of the auxiliary valve of Figs. 1 and 2; Fig. 4 is a front elevational view thereof; Fig. 5 is a side elevational view of the main valve, and Fig. 6 is a view thereof in front elevation.

For the purpose of illustration, 1 have shown my invention applied to a locomotive boiler, only the front sheet 7 of which is illustrated. The sheet 7 isformed in the usual manner, to" provide screw thread connecs tion with a valve. In the present instance I provide an auxiliary valve block 8 that has a threaded extension 9 for effecting engagement with the sheet 7. The valve block 8 is provided with a recess within which an aux iliary or check valve 10 may have longitudinal' movement. valve 10 is provided with a number of longitudinal recesses 11 (shown more clearly in Figs. and t) that permit passage of fluid from the forward central aperture 12 of the valve block 8 to the rear end of the valve 10. The rear end of the valve 10 is provided with a seating surface 13 that seats against the forward end of a main valve block 14,

to seal the aperture-15 contained in said block 1d against communication with the passage 12 and the interior of the boiler. The valve 10 seats against a rearwardly extending stem 16 as shown in the drawing, but may be formed integrally therewith, and loosely fits within a recess in the main valve 1. is shown as seated against the bottom of the recess in the valve 17, the valve 10 thus being held in forward position against the pressure in the boiler.

The valve 17 is provided with a rearwardly extending projection 18 that fits loosely within a valve stem 19 that is hollowed at its forward end. The valve stem 19 has.

screw threaded engagement with a nut 20 that in turn has a screw threaded connection with the valve block 14. A stuffing box or packing retaining member 21 is provided to preventleakage of fluid along the valve stem 19 and the usual hand wheel 22 is provided for the stem 19, to effect longitudinal The body portion of the In Fig. 1 the rear end of the stem 16 i not for such distance as to permit the seating surface. 13 thereof to engage the forward end of the valve block. If the valve 17 be then closed the valve 10 will of course be moved forward again against the pressure of the boiler.

hen it is desired to grind the valve 17, the hand wheel 22 is rotated a sufiicient distance to withdraw the valve 17 until the valve 10 seats against the forward end of the block 14land seals the forward end of the opening 15. The nut 20 may then be removed from the block 14, carrying with it the valve stem 19 and the valve 17. The valve 17 may thereafter be removed from the stem 19 and reground or a new valve substituted. It will, 01" course, be apparent that the valve 17 may be rigidly secured to the stem 19, but I prefer to make it separable in order to avoid discarding the entire valve stem when the valve becomes too worn for further grinding, or for convenience in quickly inserting previously ground valves in a valve stem, or for more conveniently manipulating the valve while grinding the same, and further to permit it to more readily seat when closed.

lVhen the parts are reassembled and the valve 17 is moved to its seat, as above described, it of course engages the rear end of the stem 16 and unseats the auxiliary valve 10, as shown in Fig. 1.

Various changes in detail and general arrangement may be readily made without departing from the spirit and scope as delined in the accompanying claim.

I claim as my invention:

Valve structure comprising an auxiliary valve chamber adapted to communicate at its forward end with a source of pressure,

a main valve block disposed to the rear of said chamber and whose forward end extends into said chamber, a valve-movable longitudinally of said chamber and having radially extending projections that engage the wall of the chamber, a main valve in said valve block, and a spacing member between said valves whereby when the main valve is moved forwardly the auxiliary valve will be moved forwardly, the said radial projections serving as the sole bearing members for said auxiliary valve and providing spaces for the passage of fluid, and the rear end of said auxiliary valve and the forward end 01 said main valve block having substantially flat co-operating surfaces.

In testimony whereof I, the said GEORGE B. CLARK, have hereunto set my hand.

GEORGE B. GDARK. 

